Step 1

Mix all three boxes of the vanilla instant pudding with the ice cold milk in a very large kitchen bowl.  Works best if you use a whisk.

Step 2

Add the sour cream and half of the cool whip (just eye ball it) and mix well till blended. This will require quite a bit of effort.  Start with a spatula and then switch to a whisk for best effect.  The cool whip will want to float and blop around.  Just keep going, it will eventually mix in.

Step 3

Use 1/3 each of the pudding, vanilla wafers and bananas and layer in that order.  Repeat this way until bowl is filled. After all layers are completed, top with the remaining half of the cool whip and sprinkle the crumbs from the bottom of the box onto the top of the pudding.